I only had this problem when drawing the pistol in a hurry, like in a life and death situation. If drawing slow no problem . I believe the longer grip with the extended mag will do away with this minor problem . Will update after using for a few days. I will use the shorter mag as a backup since i always carry a spare when packing.
As a fellow lefty and likely future Shield owner I'm looking forward to your updates. Thanks for Beta Testing for the rest of us.